B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/737
B29D 23/03 (1980.01)
Patent
CA 1039911
ABSTRACT OF THE DISCLOSURE The invention provides an apparatus for producing a predominantly mon-axially molecularly oriented film of thermo- plastic polymeric material, comprising a die for extruding a tube of thermoplastic polymeric material along the axis thereof, means within said die for the introduction of gas into said tube and maintaining sufficient gas pressure within said tube to prevent the collapse thereof, roll means spaced from said extruding die for hauling off said tube, at least one mandrel positioned within said tube at least one said mandrel being rotatable about said axis means positioned within at least one said mandrel for cooling said mandrel, means for blowing gas onto the outer surface of the film between said die and the mandrel nearest to said die, and means within said tube for heating at least the inner surface of said tube, and at least one of said roll means and said die being also rotatable about the die axis so that the film is spirally stretched upstream of said roll means.
263242
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